Create 10 practical strategies with which the self-employed in Germany can design their retirement planning effectively and tax-optimized to ensure long-term financial security.

Context: [retirement planning, self-employed, Germany, private pension insurance, basic pension, Riester pension, company pension, tax incentives, retirement planning, financial security]

Goal: [demonstrate diverse retirement options, utilize tax advantages, secure the future despite lack of statutory pension insurance, practical implementation tips, avoid coverage gaps]

For each strategy explain:
1) the specific form of retirement provision or measure including relevant conditions and requirements
2) notes on tax treatment and funding opportunities
3) opportunities, risks, and practical tips for implementation specifically for the self-employed

The strategies should:
- consider different retirement paths (private, state-subsidized, occupational)
- be understandable and feasible even for self-employed without mandatory pension insurance
- include current legal framework conditions in Germany
- motivate conscious and sustainable retirement planning